Java URI Create addParams(URI uri, Map<String, List<String>> params, Set<String> overridenParams)

Description

Add the given params to the query

License

Open Source License

Parameter

Parameter	Description
uri	The query
params	The params to add
overridenParams	A set of parameter names that must be overriden and not added

Exception

Parameter	Description
URISyntaxException	an exception
UnsupportedEncodingException	an exception

Return

The new query

Declaration

public static URI addParams(URI uri, Map<String, List<String>> params, Set<String> overridenParams)
        throws URISyntaxException, UnsupportedEncodingException

Method Source Code


//package com.java2s;
/*/*from w  w w  . j a  v a 2  s.com*/
 * Copyright (C) 2008 Patrick Valsecchi
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  U
 */

import java.io.UnsupportedEncodingException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.StringTokenizer;

public class Main {
    /**
     * Add the given params to the query
     *
     * @param uri             The query
     * @param params          The params to add
     * @param overridenParams A set of parameter names that must be overriden and not added
     * @return The new query
     * @throws URISyntaxException
     * @throws UnsupportedEncodingException
     */
    public static URI addParams(URI uri, Map<String, List<String>> params, Set<String> overridenParams)
            throws URISyntaxException, UnsupportedEncodingException {
        if (params == null || params.size() == 0) {
            return uri;
        }
        final String origTxt = uri.toString();
        int queryStart = origTxt.indexOf('?');
        final StringBuilder result = new StringBuilder();
        if (queryStart < 0) {
            int fragmentStart = origTxt.indexOf('#');
            if (fragmentStart < 0) {
                result.append(origTxt);
            } else {
                result.append(origTxt.substring(0, fragmentStart));
            }
        } else {
            result.append(origTxt.substring(0, queryStart));
        }

        Map<String, List<String>> origParams = getParameters(uri);
        boolean first = true;
        for (Map.Entry<String, List<String>> param : params.entrySet()) {
            final String key = param.getKey();
            List<String> origList = origParams.remove(key);
            if (origList != null && (overridenParams == null || !overridenParams.contains(key))) {
                first = addParams(result, first, key, origList);
            }
            List<String> list = param.getValue();
            first = addParams(result, first, key, list);
        }

        for (Map.Entry<String, List<String>> param : origParams.entrySet()) {
            final String key = param.getKey();
            List<String> list = param.getValue();
            first = addParams(result, first, key, list);
        }

        if (uri.getFragment() != null) {
            result.append('#').append(uri.getRawFragment());
        }

        return new URI(result.toString());
    }

    private static boolean addParams(StringBuilder result, boolean first, String key, List<String> list)
            throws UnsupportedEncodingException {
        for (int i = 0; i < list.size(); i++) {
            String val = list.get(i);
            if (first) {
                result.append('?');
                first = false;
            } else {
                result.append('&');
            }
            result.append(URLEncoder.encode(key, "UTF-8"));
            result.append("=");
            result.append(URLEncoder.encode(val, "UTF-8"));
        }
        return first;
    }

    public static Map<String, List<String>> getParameters(URI uri)
            throws URISyntaxException, UnsupportedEncodingException {
        return getParameters(uri.getRawQuery());
    }

    public static Map<String, List<String>> getParameters(String rawQuery)
            throws URISyntaxException, UnsupportedEncodingException {
        Map<String, List<String>> result = new HashMap<String, List<String>>();
        if (rawQuery == null) {
            return result;
        }

        StringTokenizer tokens = new StringTokenizer(rawQuery, "&");
        while (tokens.hasMoreTokens()) {
            String pair = tokens.nextToken();
            int pos = pair.indexOf('=');
            if (pos == -1) {
                throw new URISyntaxException(rawQuery, "Cannot find '=' sign");
            }
            String key = URLDecoder.decode(pair.substring(0, pos), "UTF-8");
            String value = URLDecoder.decode(pair.substring(pos + 1, pair.length()), "UTF-8");
            addParam(result, key, value);
        }
        return result;
    }

    public static void addParam(Map<String, List<String>> params, String key, String value) {
        List<String> list = params.get(key);
        if (list == null) {
            list = new ArrayList<String>(1);
            params.put(key, list);
        }
        list.add(value);
    }
}

Java URI Create addParams(URI uri, Map> params, Set overridenParams)

Description

License

Parameter

Exception

Return

Declaration

Method Source Code

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